c# - 发出异步休息请求

Question

我正在使用 RestSharp 在 Windows Phone 上发出一些休息请求。

但我正在努力将“Aync/await”与我使用的功能一起使用:

例如这个函数:

   private  void Function() 
        {
            var client = new RestSharp.RestClient("https://exampleapi.com");
            client.Authenticator = [....]
            var request =  new RestSharp.RestRequest("/example.json", Method.GET);
            try
            {
                client.ExecuteAsync(request, reponse =>
                {
                    if (reponse.StatusCode == HttpStatusCode.OK)
                    {


              // Operations with the json...
                    }
                    else
                    {
                        MessageBox.Show("Error");
                    }
                });
            }
            catch (Exception error)
            {
                MessageBox.Show(error.Message);
            }
        }

我试着像这样添加单词 async :

private async void restsharptest() 
            {
                var client = new RestSharp.RestClient("https://exampleapi.com");
                client.Authenticator = [....]
                var request =  new RestSharp.RestRequest("/example.json", Method.GET);
                try
                {
                    client.ExecuteAsync(request, reponse =>
                    {
                        if (reponse.StatusCode == HttpStatusCode.OK)
                        {


  var timeline =  JsonConvert.DeserializeObject<List<dynamic>>(reponse.Content);
                        }
                        else
                        {
                            MessageBox.Show("Error");
                        }
                    });
                }
                catch (Exception error)
                {
                    MessageBox.Show(error.Message);
                }
            }

但是当我尝试添加 await 时:

var timeline = await  JsonConvert.DeserializeObject<List<dynamic>>(reponse.Content);

我收到以下错误:

Impossible to reach 'System.Collections.Generic.List

和:

Operator 'await' can only be used in a lambda expression async. Mark this with lambda expression modifier 'async'.

如何使用 async/await 我的“Function1”？

编辑:

 client.ExecuteAsync(request, response  =>
            {
                if (response.StatusCode == HttpStatusCode.OK)
                {
                    List_ = new List<Myobject>();
                    List_ = await Task.Factory.StartNew(() => JsonConvert.DeserializeObject<List<Myobject>>(response.Content));
                    tcs.SetResult(RefreshList_);
                }
                else
                {
                    MessageBox.Show("Error");
                }
            });

我又遇到了这个错误:

Operator 'await' can only be used in a lambda expression async. Mark this with lambda expression modifier 'async'.

我该如何解决这个问题？

Answer 1

要使用异步，您应该执行以下操作:

private async void Function() 
{
     var client = new RestSharp.RestClient("https://exampleapi.com");
     client.Authenticator = [....]
     var request =  new RestSharp.RestRequest("/example.json", Method.GET);
     try
     {
         var response = await client.ExecuteTaskAsync(request);

         if (reponse.StatusCode == HttpStatusCode.OK)
         {
             // Operations with the json...
         }
         else
         {
             MessageBox.Show("Error");
         }
     }
     catch (Exception error)
     {
         MessageBox.Show(error.Message);
     }
  }

请注意您的 ExecuteAsync 和之前带有 await 的 ExecuteTaskAsync 之间的区别。